Can people (other than the target) hear me casting Message?

The Message spell requires verbal, somatic, and material components. The text of the spell says:

You point your finger toward a creature within range and whisper a message. The target (and only the target) hears the message…

Is the spoken message the only verbal component to the spell, or is there an incantation that I must speak at normal volume (i.e. the same volume I would use for any other verbal spell) in order to cast the spell, followed by my actual whispered message? In other words, can people other than the target hear me casting the spell at all?